Oil-well jack.



No. 822,392. PATENTED JUNE 5, 1906.

- G. B. SESSIONS.

OIL WELL JAGK.

APPLICATION FILED 0GT.4.1905.

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UNITED STATES PATENT GEORGE B. SESSIONS, OF FINDLAY, OHIO, ASSIGNOR OFONE-THIRD TO DAYTON L. SEALY AND ONE-THIRD TO WILLIAM L. DAVID, OF FIND-LAY, OHIO.

OlL-WELL JACK.

Patented June 5 1906.

Application filed October 4. 1905. Serial No, 281,215.

To all whom, 2375 may concern:-

Be it known-that I, GEORGE B. SEssroNs, of' Findlay, county of Hancock,and State of Ohio, have invented certain new and useful Improvements inOil-VVell Jacks; and I do hereby declare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the figures ofreference marked thcreon,which form part of this specification.

My invention has reference to oilwell jacks; and it has for its Objectto provide a simple, inexpensive, and eflicient device for pumpingoil-wells which shall insure a true vertical reciprocation of thepolish-rod without exerting a lateral strain thereon.

A further Object is to provide a device for pumping oil-wells whichshall be free from the tendenoy to get, out of adjustment, this beingdue to the' manner in which the working parts of the invention aredirectly supported upon the casing and casing-head without interveningbraces or auxiliary supports.

In carrying out my invention I employ the novel combination and detailsof construction hereinafter shown, described, and olaimed.

In the accompanying drawings, Figure 1 is an elevation of my improvedjaok, the operation of the same being shown by the dotted lines. Fig. 2is a plan view, the well-casing being in section; and Fig. 3 is aperspective view of the operating-arm detached.

Referring to the details, 1 indicates the well-casing 2, thecasing-head; 3, the tubing, and 4 the polish-rod.

5 is a lever centrally pivoted and supported between parallel pieces 6and 7. The outer ends 8 of said pieces are firmly secured to across-piece 9, and the inner ends are arranged on opposite sides of thecasing 1 and are clamped thereto by means of transverse bolts 10, thelatter being also disposed on opposite sides of the casing. In thismanner the lever 5 is firmly supported upon a structure which is capableof adjustment in a vertical direction upon the casing. To the upper endof the lever 5 is attached the usual surface-rod 11, connecting with asuitable power. At the lower end of the lever 5 is a casting 12, havinga bearing-socket 13 opening upwardly to receive the rounded lower end14: of the operating-arm 15, the latter being capable of instantdetachment after being disengaged from the polish-rod. Operating-arm 15is bent at its upper portion at 16 and provided with a bifurcation 17 toreceive the polish-rod 18, the latter` having collars 19 and 20 securedagainst movement thereon by means of suitable set-screws. Adjacent toits upper end the operating-arm is provided with a cam bearing-face 21,operating in movable contact upon a roller 22, mounted upon casing-head2, the curvature of the cam bearing-face being such that when the partsare properly adjusted the movement of the lever 5 will cause thebifurcated end of the operating-arm to travel in a straight verticaldirection.

In order that the operating-arm after once being adjusted shall bemaintained in adjusted position, it is essential that the support forthe roller 22, which guides the arm in its movenent, shall be extremelyfirm, since even a slight alteration in the position of the roller wouldresult in throwing the bifurcated end of the operating-arm out of linewith the polish-rod. This is accomplished by mounting the rollerdirectly upon the casing-head, thereby eliminating any possibility ofdisplaoement. The initial adjustment of the operating-arm to cause thebifuroated end thereof to travel in a straight vertical direction isefiected by raising or lowering the support for the lever 5 and thenclamping the same to the casing.

Among the advantages to be noted in the construction of my improved jackare the practical elimination of framework, the parts being directlysupported by the casing and the casing-head, the effective means foradjusting the operating-arm and for maintaining the same in adjustedposition, and the disposition of the parts whereby the pull exerted bythe surface rod is directly outward from the casing.

Having described my invention, what I claim, and desire to secure byLetters Patent, is-

1. In an oil-well jack, the 'combination with the casing, thecasing-head, and the polish-rod of a well, of a pivoted lever, a supportfor the pivot of said lever, adjustable upon the casing, anoperating-arm pivotally connected at one end to said lever and engagingICO the polish-rod at its other end, and means carried by thecasing-head for guiding said operating-arm in its movement,substantially' as described.

2. In an oil-well jaok, the combination with the casing, theoasing-head, and the polish-rod of a well, of a Support adjustable in avertioal direction upon the casing, a lever pivotally mounted upon saidsupport, a sur- 'ace rod oonnected with the upper end of said lever, anoperating arm pivoted to the lower end of Said lever, said arm engagingthe polish-rod at its=free end and having a' cam- Shapedbearing-sur'faoe adjaoent to said free end, and a roller mounted forrotation upon the casing-head `adapted to contact' with saidbearing-surfaoe to guide the operating-arm inits movement, substantiallyas described.

3. In an oil-well j'a'ok, the combination with thecasing,-thecasing-head, and the polish-rod of a well, of a supportcomprising a pair 'of members secured together at one 'end and havingtheir other ends disposed on opposite sides of the oasing, 'meanseXtending transversely of said pieces for olamping them in adjustedposition upon the casing, `a lever pivoted between its ends upon saidsupport, a surfaoe rod Connecting with the upper end of said lever, asocket at the lower end of said lever, an operating-arm detachablymounted at one end upon said socket and engaging the polish-rod at itsfiee end, said operating-arm having a cam-shaped bearing-surfaceadjacent to its free end, and a roller mounted for rotation u on thecasing-head in movable contact with said cam-shaped \bearing-surface andadapted to guide the operatin`g-arm in its movement, substantially as:described.

In testimony that I olaimrtheforegoing as my own I afix my signatureinpresenoe of two' witnesses.

GEORGE B. SESSIONS.

Witnesses:

CARL H. KELLER, CHAs. O. DEFENBAUGH.

